|
Discovery and designation
|
|
|---|---|
| Discovered by | Lincoln Laboratory Near-Earth Asteroid Research Team |
| Discovery site | Socorro |
| Discovery date | October 4, 1999 |
|
Designations
|
|
| MPC designation | 20641 |
| Alternate name(s) | 1999 TF121 |
| Epoch May 14, 2008 | |
| Ap | 3.3531577 |
| Peri | 2.6924261 |
| Eccentricity | 0.1092916 |
| Orbital period | 1919.6003136 |
| Mean anomaly | 253.96560 |
| Inclination | 2.85580 |
| Longitude of ascending node | 135.73430 |
| Argument of peri | 208.23274 |
| Absolute magnitude (H) | 14.3 |
20641 Yenuanchen (1999 TF121) is a main-belt asteroid discovered on October 4, 1999 by the Lincoln Laboratory Near-Earth Asteroid Research Team at Socorro.